Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bf6788d011e4c87efd02d9b4390a79047a9f88fdae7546d999c68e0697ac9d' 
  AND token = 'zI0VdoOztjBPhAU5brj2bPp04QoAVRrevC4nZAtxiIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}